Empirical correlation for ejector design
Journal
International Journal of Refrigeration
Journal Volume
22
Journal Issue
5
Pages
379-388
Date Issued
1999
Author(s)
Chang J.M.
Abstract
In the present study, two empirical correlations from the test results of 15 ejectors are derived for the performance prediction of ejectors using R141b as the working fluid. The ratio of the hypothetical throat area of the entrained flow to the nozzle throat area Ae/At, the geometric design parameter of the ejector A3/At, and the pressure ratios Pg/Pe and Pc*/Pe are used to correlate the performance of the ejector. The prediction of the entrainment ratio ω using the correlations is within ±10% error. A method of calculation for the ejector design using the correlations is also developed. R141b is shown in the present study to be a good working fluid for an ejector. The measured ω for the ejectors used in the present study can reach as high as 0.54 at Pg = 0.465 MPa (84 °C), Pc* = 0.087 MPa (28 °C) and Pe = 0.040 MPa (8 °C). For Pg = 0.538 MPa (90 °C), Pc* = 0.101 MPa (32 °C) and Pe = 0.040 MPa (8 °C), ω to reaches 0.45.
Publisher
Elsevier Science Ltd, Exeter
Type
journal article